White Sox acquire Luis Castillo from Mariners (source)

The White Sox are acquiring right-hander Luis Castillo in a trade with the Mariners for reliever Seranthony Domínguez, outfielder Nolan Jones and catching prospect Boston Smith, a source told MLB.com’s Mark Feinsand. The clubs have not confirmed the move.

Regardless of how or when his Mariners tenure ended, Castillo has been a defining piece to Seattle’s success of this era — and his…